The Divine Institutes

That man is sound, he is just, he is perfect. Whoever, therefore, has obeyed all these heavenly precepts, he is a worshipper of the true God, whose sacrifices are gentleness of spirit, and an innocent life, and good actions. And he who exhibits all these qualities offers a sacrifice as often as he performs any good and pious action. For God does not desire the sacrifice of a dumb animal, nor of death and blood, but of man and life. And to this sacrifice there is neither need of sacred boughs, nor of purifications, nor of sods of turf, which things are plainly most vain, but of those things which are put forth from the innermost breast.

Therefore, upon the altar of God, which is truly very great, and which is placed in the heart of man, and cannot be defiled with blood, there is placed righteousness, patience, faith, innocence, chastity, and abstinence. This is the truest ceremony, this is that law of God, as it is called by Cicero, illustrious and divine, which always commands things which are right and honourable, and forbids things which are wrong and disgraceful; and he who obeys this most holy and certain law cannot fail to live justly and lawfully.

And I have laid down a few chief points of this law, since I promised that I would speak only of those things which completed the character of virtue and righteousness. If any one shall wish to comprise all the other parts, let him seek them from the fountain itself, from which that stream flowed to us.